Low‐voltage ride‐thorough capability of photovoltaic grid‐connected neutral‐point‐clamped inverters with active/reactive power injection. Issue 8 (25th January 2017)

• Record Type: Journal Article
• Authors: Dehghani Tafti, Hossein; Maswood, Ali Iftekhar; Konstantinou, Georgios; Pou, Josep; Kandasamy, Karthik; Lim, Ziyou; Ooi, Gabriel H.P.
• Is Part Of: IET renewable power generation. Volume 11:Issue 8(2017)
• Page Start: 1182
• Page End: 1190
• Publication Date: 2017-01-25
• Subjects: photovoltaic power systems -- reactive power -- reference circuits -- invertors -- fault diagnosis -- DC‐DC power convertors -- power supply quality -- power grids; voltage 12.47 kV -- apparent power 3.3 kVA -- apparent power 150 kVA -- network voltage -- dc‐dc converter -- three‐level inverter -- fault conditions -- medium‐voltage test‐case system simulation model -- grid voltage enhancement -- photovoltaic strings -- grid code requirements -- inverter current limitation -- dq‐frame -- current references -- point of common coupling -- power system operators -- voltage sags -- medium‐scale grid‐connected photovoltaic power plants -- large‐scale grid‐connected PVPP -- active power injection -- reactive power injection -- photovoltaic grid‐connected neutral‐point‐clamped inverters -- low‐voltage ride‐thorough capability; Renewable energy sources -- Periodicals; 333.79405
• DOI: 10.1049/iet-rpg.2016.0544
• Languages: English
• ISSNs: 1752-1416

Abstract

Abstract : Low‐voltage ride‐thorough capability is among the challenges in the operation of medium‐ and large‐scale grid‐connected photovoltaic power plants (PVPPs). In addition, reactive power injection during voltage sags is required by power system operators in order to enhance the voltage of the point of common coupling. The performance of medium‐ and large‐scale grid‐connected PVPPs during these events is studied. An algorithm for the calculation of current references, in the dq ‐frame, during voltage sags is introduced, which considers the inverter current limitation, grid code requirements and the amount of extracted power from photovoltaic strings. The proposed algorithm uses the full current capacity of the inverter in injecting active or reactive powers to the grid during voltage sags, which leads in a better grid voltage enhancement. The performance of proposed control strategies is investigated on a 150‐kVA PVPP connected to the 12.47‐kV medium‐voltage test‐case system simulation model during different fault conditions. An experimental setup of the 3.3‐kVA grid‐connected three‐level neutral‐point‐clamped inverter with a dc/dc converter illustrates and validates the performance of the controller in injecting required active/reactive power and supporting the network voltage.